◎ 题干
When Edison was a child, he was always asking questions and ____ new ideas.
[     ]
A. trying out  
B. try out        
C. tried out      
D. trying
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“When Edison was a child, he was always asking questions and ____ new ideas.[ ]A. trying out B. try outC. tried out D. trying…”主要考查了你对  【动词短语】【一般过去时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。